From 8432bdb2905713cb3ef5cbe4a72630fa575565ad Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Mon, 28 Nov 2016 01:47:40 +0200 Subject: [PATCH] nvme: Make controller state visible via sysfs Easier for debugging and testing state machine transitions. Signed-off-by: Sagi Grimberg Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- drivers/nvme/host/core.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 44a1a25..d529780 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1577,6 +1577,29 @@ static ssize_t nvme_sysfs_show_transport(struct device *dev, } static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL); +static ssize_t nvme_sysfs_show_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + static const char *const state_name[] = { + [NVME_CTRL_NEW] = "new", + [NVME_CTRL_LIVE] = "live", + [NVME_CTRL_RESETTING] = "resetting", + [NVME_CTRL_RECONNECTING]= "reconnecting", + [NVME_CTRL_DELETING] = "deleting", + [NVME_CTRL_DEAD] = "dead", + }; + + if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) && + state_name[ctrl->state]) + return sprintf(buf, "%s\n", state_name[ctrl->state]); + + return sprintf(buf, "unknown state\n"); +} + +static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL); + static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, struct device_attribute *attr, char *buf) @@ -1609,6 +1632,7 @@ static struct attribute *nvme_dev_attrs[] = { &dev_attr_transport.attr, &dev_attr_subsysnqn.attr, &dev_attr_address.attr, + &dev_attr_state.attr, NULL }; -- 2.7.4